/**************************************************************************
 *
 * Copyright (C) 2007 University of California, Los Angeles.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *************************************************************************/

package edu.ucla.cs.typecast.net;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.MulticastSocket;

/**
 * 
 * This is a special EndPointListener that manages a Multicast end point.
 * 
 * @date Jul 25, 2007 
 */
public class MulticastEndPointListener extends AbstractUDPEndPointListener implements TypeCastConstants {
	
	public DatagramSocket createSocket(EndPoint endPoint) throws IOException {
		if (endPoint.getAddress().isMulticastAddress()) {
			MulticastSocket socket = new MulticastSocket(endPoint.getPort());
			socket.setTimeToLive(MAX_TTL); 
			socket.setLoopbackMode(false);
			socket.joinGroup(endPoint.getAddress()); 
			return socket; 
		} else { 
			throw new RuntimeException("The address " + endPoint.getAddress() + " is not mutlicast address"); 
		}		
	}

	public void shutdownSocket(DatagramSocket socket, EndPoint endPoint) throws IOException{
		if (endPoint.getAddress().isMulticastAddress()) { 
			try { 
				((MulticastSocket)socket).leaveGroup(endPoint.getAddress()); 
				socket.close(); 
			} catch(Throwable t) { 
				t.printStackTrace(); 
			}
		} else { 
			throw new RuntimeException("The address " + endPoint.getAddress() + " is not mutlicast address"); 
		}
	}

}
